Serial Ata Power
Reading time : 1 minute
Published on 18 Jun 2020 - Updated on 05 Dec 2020
Connector pinout
| Pin | Signal |
|---|---|
| 1 | +3.3V (obsolete) |
| 2 | +3.3V (obsolete) |
| 3 | +3.3V precharge (obsolete) |
| 4 | GND |
| 5 | GND |
| 6 | GND |
| 7 | +5V precharge |
| 8 | +5V |
| 9 | +5V |
| 10 | GND |
| 11 | Optional |
| 12 | GND |
| 13 | +12V precharge |
| 14 | +12V |
| 15 | +12V |
Precharge
SATA power connector is designed to support hotplug and reduce inrush current when connecting a HDD.
This is done by using different pin length on connector to ensure that connecting sequence occurs as follow :
- Ground
- 1x contact on each power rail named as “precharge” contact
- Other contacts
Recommended precharge resistance value is between 10 and 20 Ohms.
